Pump base



FIG. 1 is a perspective view of a pump base showing my new design, the broken line showing of a pump, engine, handle, wheels, hose and gun is for illustrative purposes only and forms no part of the claimed design;

FIG. 2 is a more detailed perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a rear elevational view thereof;

FIG. 8 is a bottom plan view thereof; and,

FIG. 9 is a detailed front and side perspective view thereof.

The structure shown in FIGS. 1 and 9 in broken lines is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a pump base, as shown and described. 